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4. A report to the technology strategy board as part of the technology strategy board’s building performance evaluation programme;M Fletcher,2014
5. Feist, W. (2005). Hochwärmegedämmte Dachkonstruktionen, Arbeitskreis kostengünstige Passivhäuser, Phase III, Protokollband Nr. 29, Passive House Institute, Darmstadt, 2005.